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beautician should wear insulated gloves during operation. 2.do not wear any aglet, both for the beautician and the users. 3.the electrode probe must be fully in contact with skin. 4.do not make the rf electrode stay on any part without moving. keep it moving on skin slowly. 5.skin around eyes and forehead is very thin, the rf output intensity should be relatively weakened. 6.do not contact skin with unipolar when using of bipolar, tripolar,hexpolar rf work head otherwise it will produce pulse